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| Methods | Parallel assignment randomised controlled trial |
| Participants | 12‐21 year‐old medical patients attending for routine care |
| Interventions | Motivational enhancement therapy |
| Outcomes | Frequency of tobacco, alcohol, marijuana and other drug use |
| Study identifier | NCT00907309 |
| Notes | Study has been listed as completed on the registry web site. No results are currently available. |
